Pressing DEL on a blank line in FSEditor causes a crash

Pressing DEL on a blank line causes the error "The impossible happened" within FSEditor when writing a message.

In this example DEL is pressed betweeen the two lines of text.

assigned to @Deuce

Also see issue #200

Was that the last blank line or one of the blank lines in the middle?

In the middle

closed with commit fbc43888

That fix works great - thanks.

mentioned in commit fbc43888

mentioned in commit 2ca9d321